机械风表检测试验模型的显著性检验

Significance Check of Rectifying CurveModel for Mechanical Air-flow meter

采用机械风表测定巷道、通风管道的风流速度时,各风表分别对应有一风速校正图,以此通过风表转速而查知测量地点对应的真风速。风表的风速校正图是在实验室的风洞式风表校正仪上通过对风表的检测而确定的。根据机械风表的性能特点,检测的数据回归模型是一元线性模型。但检测测量的数据是否能够真正反应风表转速与真风速之间的某种线性相关关系,还需对所测定的数据根据一元线性回归的特点,在给定的检测精度下进行显著性检验。只有通过显著性检验,所提交的风表校正图及校正方程才能用于工程巷道、管道的测风实践。

At the time of using the mechanical air-flow meter to measure air velocity in tunnel and air duct, all air-flow meters are provided with the corresponding air velocity rectifying curve respectively so as to make use of rotation speed of the air-flow meter to find the real air velocity corresponding to the measured location. The air velocity rectifying curve for the air-flow meter was determined according to the air-flow meter inspection done on the air tunnel type air-flow meter checkout instrument in the laboratory. Based on performance features of the mechanical air-flow meter, the regression model for the inspected data is monadic linear model. However, it could not be clear whether the inspected data can really reflect a correlative linear relation of air-flow meter rotating speed with real air velocity, so the inspected data are required to receive the significance check at the given inspecting accuracy according to the features of monadic linear regression. Only through the significance check, can the rectifying curves for air-flow meters and the rectifying equation, which have been presented, be used for practice in air measurement of tunnel and air duct.